Your first American mahjong game will go fine until about ninety seconds in. The tiles get dealt, everyone stares at their rack for a moment, and then three people start sliding tiles sideways at each other without a word of explanation. Nobody tells you what is happening. You are supposed to already know. That is the Charleston. It is the part of the game that has no equivalent in Chinese or Japanese mahjong, and it is the part that decides most hands before a single tile is drawn from the wall. So what is it, exactly After the deal, every…

Pick up a tile from an American set and one from a Chinese set and they feel like the same family. Sit down at the two tables, though, and you will see two different games wearing similar clothes. If you have learned one and you are curious about the other, here is where they actually part ways. The sets are not the same size An American set carries 152 tiles. A standard Chinese set carries 144. That gap matters more than it sounds. The eight extra tiles in the American set are the flowers and seasons, and they are the…

American mahjong looks familiar if you have seen any kind of mahjong before. Spend five minutes at a real table, though, and you will notice it plays by its own rules. The tiles are there. The clicking and shuffling are there. But the goals, the scoring, and even the rhythm feel different. If you have been curious about picking it up, here is the plain version of how it works and what makes it such a social obsession. Where it came from The American game grew out of the classic Chinese version that came over with immigrant families in the…